Department of Pathology & Experimental Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. Department of Internal Medicine, Shigei Medical Research Hospital, Okayama, Japan. Advanced Institute for Materials Research, Tohoku University, Miyagi, Japan. Division of Hemodialysis and Apheresis, Okayama University Hospital, Okayama, Japan. Kobayashi Medicine Clinic, Okayama, Japan. Department of Dialysis Access Center, Shigei Medical Research Hospital, Okayama, Japan.